What is a vaccine?

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(C) vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. It typically contains an agent that

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Inactivated pathogens

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(C) vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. It typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe,its toxins,or one of its surface proteins. Therefore,vaccines consist of inactivated or attenuated (weakened) pathogens or their components,which stimulate the immune system to recognize the agent as a threat,destroy it,and keep a record of it so the immune system can more easily recognize and destroy any of these microorganisms that it later encounters.

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